Fast and reliable channel classification algorithms in bluetooth networks to detect and avoid 2.4 GHz interferers

• US 7,995,687 B2
• Filed: 03/05/2007
• Issued: 08/09/2011
• Est. Priority Date: 03/05/2007
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Grushkevich, Asif, Jerlhagan, Sven, Desai, Prasanna, Walley, John, Mak, Siukai, Ibrahim, Brima
• Primary Examiner(s): Payne; David C
• Assistant Examiner(s): File; Erin M
• Application Number:
  US11/682,052
• Publication Number:
  US 20080219323A1
• Time in Patent Office: 1,618 Days
• Field of Search: 375/346
• US Class Current: 375/346
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

Aspects of a method and system for fast and reliable channel classification in Bluetooth networks to detect and avoid channel interferers may include one or more processors that may enable performance of signal strength measurements on received Bluetooth signals at a current selected frequency. At least one data packet received via the Bluetooth signals may be processed to determine the presence of bit errors. The processor(s) may enable characterization of the Bluetooth signals at the current selected frequency based on the signal strength measurements and/or the processing of the data packets. The current selected frequency may be selected during adaptive frequency hopping based on the characterization.

Claims

1. A method for frequency selection in a wireless communication system, the method comprising:

in a wireless device;

performing at least one signal strength measurement on a corresponding at least one Bluetooth signal received at a current selected frequency;

processing at least one data packet received via said received at least one Bluetooth signal to determine the presence of bit errors;

characterizing said received at least one Bluetooth signal received at said current selected frequency based on said at least one signal strength measurement and/or said processing said at least one data packet;

classifying said current selected frequency based on said characterization of said received at least one Bluetooth signal received at said current selected frequency, and based on an assessment of said current selected frequency received from one or more additional wireless devices; and

selecting, during adaptive frequency hopping (AFH), said current selected frequency based on said classification.

2. The method according to claim 1, comprising performing said at least one signal strength measurement and said processing said at least one data packet within a current channel classification update interval.

3. The method according to claim 2, comprising maintaining a signal clear count of a number of instances during said current channel classification update interval, wherein a value of said at least one signal strength measurement is less than or equal to a threshold value.

4. The method according to claim 3, comprising performing said processing of said at least one data packet for each of said value of said at least one signal strength measurement that is greater than said threshold value.

5. The method according to claim 4, comprising maintaining a signal interference count of a number of instances, wherein at least one bit error is detected in said processed at least one data packet for each of said value of said at least one signal strength measurement that is greater than said threshold value.

6. The method according to claim 5, comprising performing said characterizing by comparing a ratio of said signal clear count and said signal interference count to a threshold ratio.

7. The method according to claim 6, wherein said characterizing determines whether said received at least one Bluetooth signal is Good or Bad based on said comparing.

8. The method according to claim 7, comprising selecting said current selected frequency when said received at least one Bluetooth signal is Good.

9. The method according to claim 7, comprising removing said current selected frequency from an available channel map when said received at least one Bluetooth signal is Bad.

10. The method according to claim 9, comprising generating an updated available channel map based on said available channel map and at least one received auxiliary available channel map.

11. The method according to claim 10, comprising selecting a weighting factor for said generating of said updated available channel map.

12. The method according to claim 9, comprising removing at least one frequency, other than said current selected frequency, from said available channel map.

13. The method according to claim 1, comprising performing at least one signal strength measurement at a frequency other than said current selected frequency.

14. The method according to claim 13, comprising performing said at least one signal strength measurement within a current channel classification update interval.

15. The method according to claim 14, comprising computing an average value for said at least one signal strength measurement during said current channel classification update interval.

16. The method according to claim 15, comprising comparing said average value to a threshold value.

17. The method according to claim 16, comprising removing said frequency, other than said current selected frequency, from an available channel map based on said comparing.

18. A system for frequency selection in a wireless communication system, the system comprising:

at least one processor to be utilized in a wireless device, said at least one processor enables performance of at least one signal strength measurement on a corresponding at least one Bluetooth signal received at a current selected frequency;

said at least one processor enables processing of at least one data packet received via said received at least one Bluetooth signal to determine the presence of bit errors;

said at least one processor enables characterization of said received at least one Bluetooth signal received at said current selected frequency based on said at least one signal strength measurement and/or said processing of said at least one data packet;

said at least one processor enables classification of said current selected frequency based on said characterization of said received at least one Bluetooth signal received at said current selected frequency, and based on an assessment of said current selected frequency received from one or more additional wireless devices; and

said at least one processor enables selection, during adaptive frequency hopping (AFH), of said current selected frequency based on said classification.

19. The system according to claim 18, wherein said at least one processor enables performance of said at least one signal strength measurement and said processing of said at least one data packet within a current channel classification update interval.

20. The system according to claim 19, wherein said at least one processor enables maintenance of a signal clear count of a number of instances during said current channel classification update interval, wherein a value of said at least one signal strength measurement is less than or equal to a threshold value.

21. The system according to claim 20, wherein said at least one processor enables performance of said processing of said at least one data packet for each of said value of said at least one signal strength measurement that is greater than said threshold value.

22. The system according to claim 21, wherein said at least one processor enables maintenance of a signal interference count of a number of instances, wherein at least one bit error is detected in said processed at least one data packet for each of said value of said at least one signal strength measurement that is greater than said threshold value.

23. The system according to claim 22, wherein said at least one processor enables performance of said characterization by comparing a ratio of said signal clear count and said signal interference count to a threshold ratio.

24. The system according to claim 23, wherein said characterization determines whether said received at least one Bluetooth signal is Good or Bad based on said comparison.

25. The system according to claim 24, wherein said at least one processor enables selection of said current selected frequency when said received at least one Bluetooth signal is Good.

26. The system according to claim 24, wherein said at least one processor enables removal of said current selected frequency from an available channel map when said received at least one Bluetooth signal is Bad.

27. The system according to claim 26, wherein said at least one processor enables generation of an updated available channel map based on said available channel map and at least one received auxiliary available channel map.

28. The system according to claim 27, wherein said at least one processor enables selection of a weighting factor for said generation of said updated available channel map.

29. The system according to claim 26, wherein said at least one processor enables removal of at least one frequency, other than said current selected frequency, from said available channel map.

30. The system according to claim 18, wherein said at least one processor enables performance of at least one signal strength measurement at a frequency other than said current selected frequency.

31. The system according to claim 30, wherein said at least one processor enables performance of said at least one signal strength measurement within a current channel classification update interval.

32. The system according to claim 31, wherein said at least one processor enables computation of an average value for said at least one signal strength measurement during said current channel classification update interval.

33. The system according to claim 32, wherein said at least one processor enables comparison of said average value to a threshold value.

34. The system according to claim 33, wherein said at least one processor enables removal of said frequency, other than said current selected frequency, from an available channel map based on said comparison.